BIOL 111 Lecture Notes - Lecture 5: Pteridophyte, Pollen Tube, Microphyll

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Andrew Hendry

Document Summary

Pg easy (release many gametes to water) Ps difficult; limited by light intensity underwater. H hard; evolved special organs through roots; conserved through stomata regulation. Own hard; use roots and vascular tissue transport system. Pg protected: sperm is always carefully released in vicinity of egg, female gamete kept anchored inside protective structure. Fert (fusion of gametes) -> zyg (2n) mit-> multicell sporophyte (plant) Mei -> spore (n) mit-> male or female multicell gametophyte mit-> gamete; Whether gametes are of similar size and shape. Whether spores which sporophyte produces are similar or different. Waxy cuticle and stomates to regulate water loss. Haploid structure producing and containing male gametes (sperm). Haploid structure producing and containing female gamete (eggs). Ex. in byrophytes, the sporophyte depends on gametophyte for nutrition. Mature (n) gametophyte have antheridia and archegonia which produce sperm and egg. Sperm swim to egg (sperm are motile) and fertilize the egg in the archegonium.